Absorbent structures comprising coated super-absorbent polymer particles
First Claim
1. A particulate super-absorbent material comprising a particulate core of super-absorbent polymers, said particulate core coated with a coating agent consisting essentially of an organic coating compound having from 2 to 14 carbon atoms which has one or more polar groups, wherein the particulate super-absorbent material has a contact angle and a corresponding cos CAm, wherein the cos CAm is greater than 0.3 and wherein said coating agent is the form of particles, said particles having a mean particle size of from 0.001 to 1 micron.
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Abstract
This invention is directed to super-absorbent material, which comprises a super absorbent polymer core that is coated with an organic, polar coating agent, and whereby the particulate super-absorbent material has a contact angle and a corresponding cos CAm (as defined herein), whereby the cos CAm is more than 0.3, and whereby, when said coating agent is in the form of particles, said coating agent particles have a (weight) mean particle size of from 0.001 to 1 micron. The material is useful for absorbent structures and absorbent articles (comprising such structures). The coated super-absorbent material is typically present in said absorbent structure at least at a concentration of 50% by weight of the structure, preferably even 80% or even 90%. The invention also provides a process for making the absorbent material.
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Citations
12 Claims
- 1. A particulate super-absorbent material comprising a particulate core of super-absorbent polymers, said particulate core coated with a coating agent consisting essentially of an organic coating compound having from 2 to 14 carbon atoms which has one or more polar groups, wherein the particulate super-absorbent material has a contact angle and a corresponding cos CAm, wherein the cos CAm is greater than 0.3 and wherein said coating agent is the form of particles, said particles having a mean particle size of from 0.001 to 1 micron.
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12. A particulate super-absorbent material comprising a particulate core of super-absorbent polymers, said particulate core coated with a coating agent consisting essentially of an organic coating compound having from 2 to 14 carbon atoms which has one or more polar groups, wherein said coating agent of said particulate super-absorbent material provides a surface tension reduction of less than 10% and wherein said coating agent is in the form of particles having weight mean particle size of from 0.001 to 1 micron.
Specification